ClassCastException - JavaScriptObject cannot be cast to java.lang.String

Question

My GWT app is throwing this exception:

Caused by: java.lang.ClassCastException: com.google.gwt.core.client.JavaScriptObject$ cannot be cast to java.lang.String

When getting the String response of this function via JSNI:

public final native String data()/*-{
    return $wnd.getdata();
}-*/;

}

Here's the Javascript code:

  function getdata(){
    var data = MyObject.data();
    console.log(data);
    return data;
  }

I'm logging the data output from Firebug and here's the output (to check if the js function is actually returning something):

-0.00030517578125,0.00006103515625,0.00115966796875,0.00146484375,-0.00091552734375,-0.000946044921875,-0.001983642578125,-0.003997802734375,-0.005126953125,-0.00360107421875,-0.0032958984375,-0.004119873046875,-0.00433349609375,-0.0023193359375,-0.0008544921875,-0.003448486328125,-0.00347900390625,-0.0054931640625,-0.0067138671875,-0.005279541015625,-0.006072998046875,

Aaron Digulla · Accepted Answer · 2012-05-08 10:39:43Z

1

A simple solution is probably $wnd.getdata().toString(); but maybe you should try typeof $wnd.getdata() to see what the type really is -- maybe it's a bug lurking somewhere else.

answered May 8, 2012 at 10:39

Aaron Digulla

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4 Comments

quarks Over a year ago

its weird typeof shows that the type is "object", from the MyObject function data: function(){ return this.flashInterface().data().split(";"); }, but from the Actionscript function it is defined like this : protected function data():String { ... }

Aaron Digulla Over a year ago

Does Actionscript return real JavaScript strings or just objects which have the same API and therefore behave like JavaScript strings?

quarks Over a year ago

So I presumed that the return value is ultimately a String, beside the fact that console.log shows that is a string of comma-separated floating point

quarks Over a year ago

It seems toString is the way to get the output

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